/*
 *  Copyright 2021 Netflix, Inc.
 *
 *     Licensed under the Apache License, Version 2.0 (the "License");
 *     you may not use this file except in compliance with the License.
 *     You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 *     Unless required by applicable law or agreed to in writing, software
 *     distributed under the License is distributed on an "AS IS" BASIS,
 *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *     See the License for the specific language governing permissions and
 *     limitations under the License.
 *
 */
package com.netflix.hollow.api.perfapi;

@FunctionalInterface
public interface HashKeyExtractor {

    public Object extract(Object extractFrom);
    
    public default Object[] extractArray(Object extractFrom) {
        Object obj = extract(extractFrom);
        if(obj.getClass().isArray()) {
            return (Object[])obj;
        }
        return new Object[] { obj };
    }
    
}
